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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`sys.exit` unpacks its argument if it is a 0- or 1-element tuple","articleBody":"# Bug report\n\n### Bug description:\n\nThe documentation of [`sys.exit`](https://docs.python.org/3/library/sys.html#sys.exit) says “The optional argument _arg_ can be an integer giving the exit status (defaulting to zero), or another type of object. \\[...] If another type of object is passed, `None` is equivalent to passing zero, and any other object is printed to [`stderr`](https://docs.python.org/3/library/sys.html#sys.stderr) and results in an exit code of 1.” This is no longer true for 0- and 1-element tuples in Python 3.12 and later. It acts like the argument is unpacked: `sys.exit(())` is treated like `sys.exit()` and `sys.exit((x,))` is treated like `sys.exit(x)`.\n\n```console\n$ python3.11 -c 'import sys; sys.exit(())'; echo $?\n()\n1\n\n$ python3.12 -c 'import sys; sys.exit(())'; echo $?\n0\n\n$ python3.11 -c 'import sys; sys.exit((2,))'; echo $?\n(2,)\n1\n\n$ python3.12 -c 'import sys; sys.exit((2,))'; echo $?\n2\n```\n\n### CPython versions tested on:\n\n3.12, 3.13, CPython main branch\n\n### Operating systems tested on:\n\nmacOS\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-135789\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/dscorbett","@type":"Person","name":"dscorbett"},"datePublished":"2025-05-07T02:50:18.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/133548/cpython/issues/133548"}